St. John’s Wort

Also known as: Klamath Weed

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Clinical Signs: Photosensitization (ulcerative and exudative dermatitis).
Family: Clusiaceae
Scientific Name: Hypericum perforatum
Toxic Principles: Hypericin

Source: ASPCA Toxic and Non-Toxic Plants list (dogs), scraped 2026-07-14 from https://www.aspca.org/pet-care/animal-poison-control/dogs-plant-list · view original